well i have been running a solid .51 bar and i wanted to up the boost so i went to .72 it ran good for a few runs on the street, i let it sit for 2 days then i was taking it to funday sunday in orlando and on my way there it just started reving rapidly back and forth from about 5,400-5,700ish, no matter what gear or whatever, i have plenty of fuel and my timing is good to, at that rpm is when my turbo is usually at full boost. i am running the hack, btm, and a mr. gasket stackable head gasket, oh its sohc mini me btw, but i checked all my wiring and i got new plugs and wires, i even turned off my boost control and put everything like it was before and it still continues, oh and i also unplugged the computer to reset it to see if that would do anything but now i am out of ideas, well if anyone has any ideas for me let me know thanks in advance
brett

 

check your throttle cable it might be stuck

 

but it runs good under normal conditions..

 

does it rev up and down no matter what? like if you are just sitting there (supposed to be idling)

 

check for vacuum leaks.

 

i will check today but i am pretty sure all vacume lines are good, i will have to rev it later i would do it now but i am at work and open downpipe is loud.. i sure you guys know what i am saying thanks again

 

forgot to say now its doing it around 4500 rpms or sometimes earlier

 

well it will rev up just fine and my vacume lines are all good, anyone else have a suggestion? thanks

 

I had a problem similair to that a while back but my car is basically stock...have you looked under the hood while its doing it...when i did i heard air rushing out somewhere and it was coming out the back of the intake manifold where this sensor came unbolted...god knows how that happend...just a shot in the dark

 

i will check it out thanks

 

the reason why you have problems is because you have to be carefull duh...